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A short presentation on how to cut a cavetto mould on sandstone

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- 1. Cutting a Cavetto MouldIntroduction for Stonemasons Stonemasonry Department 2012
- 2. Mould RecognitionA cavetto moulding consists of a TOP BED OF STONEnumber of elements which can be FILLETseen in the diagram. It is essentialthat you are able to readily CAVETTOidentify each element so that youcan follow the correct proceduresfor setting out and cutting acavetto mould. FILLET FACE OF STONE
- 3. Roman Mould Development Begin by marking the total width of the mould on the base line to form points A and B. A 140mm B
- 4. Roman Mould Development Begin by marking the total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run through points A and B 140mm A 140mm B
- 5. Roman Mould Development C D Begin by marking the total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run through points A and B 140mm Mark the total height of the mould from point A and strike a line to form a perfect square and form points C and D A 140mm B
- 6. Roman Mould Development Begin by marking the 20mm total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run 60mm through points A and B Mark the total height of the mould from point A and strike a line to form a perfect square and form points C and D 20mm Construct the grid for the mould using the appropriate sizes 20mm 60mm 20mm
- 7. Roman Mould Development Begin by marking the total width of the mould E on the base line to form F points A and B. Strike lines at 90 to the base line which run through points A and B Mark the total height of the mould from point A G and strike a line to form a perfect square and form points C and D Construct the grid for the mould using the appropriate sizes Using centre E strike a curve hitting points F and G to form the cavetto.
- 8. Roman Mould Development TOP At this stage the mould is BED complete and you should darken the appropriate lines to better define the mould. If you are producing a template you should complete the template by including all relevant information eg mould name, type of template, your name, top bed and joint etc. A STUDENT FACE CAVETTO JOINT TEMPLATE
- 9. Cutting a Splay Mark splay lines on Make the lines safe using a Pitch the joints to the working the joints and scribe half inch chisel. Always lines. You may wish to lines across the face work away from the line support your stone at an and top bed to join and toward the centre of angle so that your splay is the splays. the splay. sitting level. Chisel centre section to flat. Using marginal Rough out the centreIf splay is to be seen, Check for flat across the drafts, set in the section using mel- polish to fine finish. length, width and diagonals of joints, top and point and teeth tool. the splay. bottom of the splay.
- 10. Cutting a Cavetto Hold template to top bed and face of Mark template to both Cut a splay to remove stone, making sure to align it properly joints and scribe across the waste stone. The by holding a straight edge against the the top bed and face to splay should be 2- aligned face and bringing the template join the profiles. 4mm above any to meet the straight edge. cutting lines. Run the mould through by setting in along the arrises, Set in the mould on Set in the fillets at the top and both joints and check Join the fillets bottom of the mould, checking teething down and chiselling.The mould should be checked accuracy with joint along the length with a sinking square that theyfor straight between the joints and reverse of the mould. are square and at the correctand a reverse template can be templates. depth. used to check for accuracy.
- 11. Cutting a Cavetto Video
- 12. Marking a Mitre A mitre is the term used to describe the arris formed when adjacent mouldings intersect. There are both external and internal mitres. EXTERNAL MITRE MITRE BLOCKS STEEL SQUARES There are two common methods of marking a mitre line; using mitre blocks andusing two steel squares. The mitre block method is often easier but a stonemason is more likely to carry the squares in their toolkit. Your course tutor will demonstrate each method in the workshop.
- 13. Cutting a Return Mould Begin by marking an external mitre line on the existing mould. The top point of Cut a splay to remove Mark a splay to remove this line is determined by applying the the waste stone. The the wastage from the joint template to the back of the stone splay should be 2- return mould. and squaring, from the face, to the top 4mm above any of the fillet cutting lines. Run the mould through by setting in along the Set in the mould at Set in the fillets at the top and arrises, teething down and the mitre and close to Join the fillets bottom of the mould, checkingchiselling. The mould should the ashlar stop and along the length with a sinking square that they be checked for straight check accuracy with of the mould. are square and at the correct between the joints and a reverse template. depth.reverse template can be used to check for accuracy.
- 14. Developed by The Stonemasonry Department City of Glasgow College 2012

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